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gallivm: Don't use reciprocate in lp_build_sample_wrap_linear(). 

Always clamp the scaled coordinates.
This commit is contained in:
José Fonseca 2010-06-02 12:51:38 +01:00
parent 6463dcbc01
commit a37de72967
1 changed files with 50 additions and 51 deletions
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101
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -500,11 +500,9 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
struct lp_build_context *coord_bld = &bld->coord_bld;
struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
LLVMValueRef two = lp_build_const_vec(coord_bld->type, 2.0);
LLVMValueRef half = lp_build_const_vec(coord_bld->type, 0.5);
LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
LLVMValueRef length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
LLVMValueRef coord0, coord1, weight;
switch(wrap_mode) {
@ -532,16 +530,18 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_CLAMP:
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* clamp to [0, length] */
coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f);
coord = lp_build_sub(coord_bld, coord, half);
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_clamp(coord_bld, coord, coord_bld->zero,
length_f_minus_one);
coord1 = lp_build_add(coord_bld, coord, coord_bld->one);
coord1 = lp_build_clamp(coord_bld, coord1, coord_bld->zero,
length_f_minus_one);
coord0 = lp_build_ifloor(coord_bld, coord0);
coord1 = lp_build_ifloor(coord_bld, coord1);
coord0 = lp_build_ifloor(coord_bld, coord);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
break;
case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
@ -555,7 +555,7 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
else {
LLVMValueRef min, max;
/* clamp to [0.5, length - 0.5] */
min = lp_build_const_vec(coord_bld->type, 0.5F);
min = half;
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
}
@ -574,25 +574,14 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
{
LLVMValueRef min, max;
if (bld->static_state->normalized_coords) {
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_vec(coord_bld->type, -0.5F),
lp_build_rcp(coord_bld, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
/* coord = clamp(coord, min, max) */
coord = lp_build_clamp(coord_bld, coord, min, max);
/* scale coord to length (and sub 0.5?) */
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
}
else {
/* clamp to [-0.5, length + 0.5] */
min = lp_build_const_vec(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
coord = lp_build_sub(coord_bld, coord, half);
}
/* clamp to [-0.5, length + 0.5] */
min = lp_build_const_vec(coord_bld->type, -0.5F);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
coord = lp_build_sub(coord_bld, coord, half);
/* compute lerp weight */
weight = lp_build_fract(coord_bld, coord);
/* convert to int */
@ -623,35 +612,41 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
break;
case PIPE_TEX_WRAP_MIRROR_CLAMP:
{
LLVMValueRef min, max;
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
coord = lp_build_abs(coord_bld, coord);
coord = lp_build_abs(coord_bld, coord);
coord = lp_build_clamp(coord_bld, coord, min, max);
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
if(0)coord = lp_build_sub(coord_bld, coord, half);
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_ifloor(coord_bld, coord);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
}
/* clamp to [0, length] */
coord = lp_build_min(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_ifloor(coord_bld, coord);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
break;
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
{
LLVMValueRef min, max;
/* min = 1.0 / (2 * length) */
min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
coord = lp_build_abs(coord_bld, coord);
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* clamp to [0.5, length - 0.5] */
min = half;
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_ifloor(coord_bld, coord);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
@ -661,17 +656,21 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
{
LLVMValueRef min, max;
/* min = -1.0 / (2 * length) = -0.5 / length */
min = lp_build_mul(coord_bld,
lp_build_const_vec(coord_bld->type, -0.5F),
lp_build_rcp(coord_bld, length_f));
/* max = 1.0 - min */
max = lp_build_sub(coord_bld, coord_bld->one, min);
coord = lp_build_abs(coord_bld, coord);
if (bld->static_state->normalized_coords) {
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
}
/* clamp to [-0.5, length + 0.5] */
min = lp_build_negate(coord_bld, half);
max = lp_build_sub(coord_bld, length_f, min);
coord = lp_build_clamp(coord_bld, coord, min, max);
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
weight = lp_build_fract(coord_bld, coord);
coord0 = lp_build_ifloor(coord_bld, coord);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);